fix: pip3 install now does not accept the --use-feature=in-tree-build

[4141done]

The feature flag --use-feature=in-tree-build was introduced in pip 21.1 and then
the feature was mainlined in pip 21.3. With the flag in place pip install command
fails and kic_utils fails to build.

Based on the changelog which states that this behavior is default in pip 21.3+ and the current
build installs pip 22.1 we remove the flag.

fixes #145

Proposed changes

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[qdzlug]

All looks good to me; merging so we can verify.